Check the headlight fuse under the hood and under the steering wheels inside drivers side ,then check the ground wires for each headlight if they are on tight,if that still dont work make sure your headlights bulbs are good not burned.if all above dont work then you will have to change the switch.if my info was of any help please leave a comment,vote,note.thankyou.

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Might these be "driving lights"?Cars with "driving lights" have lights that are supposed to stay on all the time the engine is running. These lights not only look like headlights, in fact some cars even have the headlights themselves come on when the engine is running. Look as some more (several) 2002 Grand Marquis's and see if they are the same.Be blessed.

I have a 2003 GMC Sierra Z71 Extended Cab and the headlight switch won't turn off the headlights while the truck is running. When I got the truck the Photocell Sensor which is the black bubble that sits on the dash that tells the daytime running lights to turn off and on was down in the dash so I fished it out with my fingers and clipped it back in and it made the daytime running lights work. I still can't turn my headlights off while my truck is running though. The owner's manual says that I am able to do so. There's 2 light's on the switch by AUTO and the O for off that should light up? Is it my whole switch?

Probably need to replace your headlight switch, it could be another problem but that is where I would start. The headlight switch is 2 or 3 switches in one, it turns on your parking lights, it turns on your interior lights and dims them too. Either that or it's your bulbs but they say you will never burn both headlights out at the same time. If you have a test light or a volt meter you could check the voltage at the headlight, that would eliminate the switch.

Sounds like a bum relay in the main underhood fuse box. My complete illustrated tutorial for repairing this $80.00 part is here: http://www.customsaab.com/Custom_Saab_NG900_OG9-3_Performance_Articles/p2_articleid/24